72028009 has 8 divisors (see below), whose sum is σ = 73189440. Its totient is φ = 70870800.

The previous prime is 72028001. The next prime is 72028037. The reversal of 72028009 is 90082027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72028009 - 2³ = 72028001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72028001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60399 + ... + 61579.

It is an arithmetic number, because the mean of its divisors is an integer number (9148680).

Almost surely, 2^72028009 is an apocalyptic number.

It is an amenable number.

72028009 is a deficient number, since it is larger than the sum of its proper divisors (1161431).

72028009 is a wasteful number, since it uses less digits than its factorization.

72028009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 72028009 is about 8486.9316599110. The cubic root of 72028009 is about 416.0707030499.

The spelling of 72028009 in words is "seventy-two million, twenty-eight thousand, nine".